<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #l1{color: green}

    .c1{color: blue}

    h1,h2{
      background-color: yellow
    }

    input[type='submit']{
      color: pink;
      background-color: red}
    input[type='button']{
      color: pink;
      background-color: red}

    *{
      border: 1px solid blue;
    }
  </style>
</head>
<body>
<ul>
  <li class="c1">刘德华</li>
  <li id="l1">张学友</li>
  <li>郭富城</li>
</ul>
<h1 class="c1">悟空</h1>
<h1>八戒</h1>
<h1>沙僧</h1>
<h2>刘备</h2>
<input type="submit" value="提交按钮">
<input type="button" value="普通按钮">

</body>
</html>